| 1 | P.A. Inc. | | USA |
| 2 | ICSE | | USA |
| 3 | Berg Steel Pipe Corp. | | USA |
| 4 | Sewickley Construction Products Inc. | | USA |
| 5 | Mcwane | | USA |
| 6 | Vinyltech | | USA |
| 7 | Urecon Systems Inc. | | USA |
| 8 | Charter Plastics | | USA |
| 9 | Rovanco Piping Systems Inc | | USA |
| 10 | Pacific Plastics Inc. | | USA |
| 11 | Magnetizer Industrial Technologies Inc | | USA |
| 12 | Piping Technology & Products Inc. | | USA |
| 13 | Layne | | USA |
| 14 | Harrison Machine & Plastics Corp. | | USA |
| 15 | Endot Industries Inc. | | USA |
| 16 | Kelolite | | USA |
| 17 | Pacific States Cast Iron Pipe Co. | | USA |
| 18 | Spartan Steel | | USA |
| 19 | Vulcan Plastics | | USA |
| 20 | GrandRiver Infrastructure Inc. | | USA |
| 21 | Pipefusion Services Inc. | | USA |
| 22 | InfraPipe Solutions LTD | | USA |
| 23 | Diamond Plastics Corp. | | USA |
| 24 | Valterra Products LLC | | USA |
| 25 | Valiant Steel | | USA |
| 26 | Spiratex Co. | | USA |
| 27 | Gibb Robert & Sons Inc. | | USA |
| 28 | Composites USA | | USA |
| 29 | Perma-Pipe Inc. | | USA |
| 30 | FlexSteel Pipeline Technologies Inc. | | USA |
| 31 | Wheatland Tube Co. | | USA |
| 32 | F.W. Webb Company Thermoplastic Piping Div. | | USA |
| 33 | Georg Fischer LLC | | USA |
| 34 | HPS Performance Silicone Hoses | | USA |
| 35 | Vinylplex Inc | | USA |
| 36 | Mammoth Carbon Products | | USA |
| 37 | Arntzen Pipe | | USA |
| 38 | Uponor Inc. | | USA |
| 39 | Aquatherm | | USA |
| 40 | Arc Mechanical Contractors Inc. | | USA |
| 41 | Oxford Plastics Inc. | | USA |
| 42 | Appalachian Piping Products Inc. | | USA |
| 43 | ISCO Industries LLC | | USA |
| 44 | Vianini Pipe Inc. | | USA |
| 45 | American Steel Pipe Div. American Cast Iron Pipe Co. | | USA |
| 46 | WL Plastics Corp. | | USA |
| 47 | Woolf Aircraft Products Inc. | | USA |
| 48 | Asahi/America Inc. | | USA |
| 49 | A-1 Alloys | | USA |
| 50 | IPEX | | USA |
| 51 | Naylor Pipe Co. | | USA |
| 52 | International Tank & Pipe Co. | | USA |
| 53 | Busada Manufacturing Corporation | | USA |
| 54 | IPEX | | USA |
| 55 | Available Plastics Inc. | | USA |
| 56 | Future Pipe Industries | | USA |
| 57 | AGRU America Inc. | | USA |
| 58 | Island Fitting | | USA |
| 59 | Town & Country Plastics Inc. | | USA |
| 60 | Scheele Engineering Corp. – SECOR | | USA |
| 61 | Thermacor Process L.P. | | USA |
| 62 | Commercial Resins | | USA |
| 63 | United Pipe Nipple Company | | USA |
| 64 | JM Eagle | | USA |
| 65 | Pipeline Plastics | | USA |
| 66 | Piping Systems Inc. | | USA |
| 67 | Everett J. Prescott Inc. | | USA |
| 68 | Wisconsin Tubing Mfg. Corp. | | USA |
| 69 | United Poly Systems | | USA |
| 70 | MRC Global | | USA |
